24 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 125 
DiaGnosis.—Dorsal ridges on segments II-VIII, those of segments 
IL-V, VIII bearing fanlike projections; bursa of medium size, with 
expanded atrial region; spermiducal gland relatively long, exceeding 
slightly anteroposterior dimension of segment VI in length; prostate 
% to subequal to spermiducal gland in diameter, subequal in length, 
- 
f 
Me 
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Ficure 6.—Pterodrilus simondsi: a, lateral view of reproductive systems; }, holotype. 
